Preconditions and environment

• Magento ver. 2.4.6-p3
• Video how to reproduce issue https://drive.google.com/file/d/1oOzDycv2IENbtrcDP7hRHaVyfBDXUas3/view?usp=sharing

Steps to reproduce

1. Go to the product page.
2. Create a Customizable Option with the drop-down type.
3. Add new values until both pages are fully populated.
4. Save the product.
5. Navigate to the Customizable Options tab.
6. Add a new value.

Expected result

The interface switches to the third page with the new value.

Actual result

The interface switches to the second page, but the new value is not added—the page remains in a constant loading state.

Screen.Recording.2025-02-19.at.11.32.54.mov

Additional information

Video how to reproduce issue https://drive.google.com/file/d/1oOzDycv2IENbtrcDP7hRHaVyfBDXUas3/view?usp=sharing

File where can be an issue vendor/magento/module-ui/view/base/web/js/dynamic-rows/dynamic-rows.js:: processingAddChild()

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.